package org.hylexus.hadoop.hadoop_2_test.mr.sort;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

public class SortStep {

	public static void main(String[] args) throws Exception {
		System.err.println("args0--in");
		System.err.println("args1--out");
		Job job = Job.getInstance(new Configuration());
		job.setJarByClass(SortStep.class);

		job.setMapperClass(SortMapper.class);
		job.setMapOutputKeyClass(InfoBean.class);
		job.setMapOutputValueClass(NullWritable.class);

		FileInputFormat.setInputPaths(job, new Path(args[0]));

		job.setReducerClass(SortReducer.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(InfoBean.class);
		FileOutputFormat.setOutputPath(job, new Path(args[1]));

		job.waitForCompletion(true);
	}

	public static class SortMapper extends Mapper<LongWritable, Text, InfoBean, NullWritable> {
		private InfoBean b = new InfoBean();

		@Override
		protected void map(LongWritable key, Text value,
				Mapper<LongWritable, Text, InfoBean, NullWritable>.Context context)
						throws IOException, InterruptedException {
			String line = value.toString();
			String[] item = line.split("\t");
			String account = item[0];
			double in = Double.parseDouble(item[1]);
			double out = Double.parseDouble(item[2]);
			b.set(account, in, out);
			context.write(b, NullWritable.get());
		}
	}

	public static class SortReducer extends Reducer<InfoBean, NullWritable, Text, InfoBean> {
		private Text k = new Text();

		@Override
		protected void reduce(InfoBean bean, Iterable<NullWritable> nullValues,
				Reducer<InfoBean, NullWritable, Text, InfoBean>.Context context)
						throws IOException, InterruptedException {
			k.set(bean.getAccount());
			context.write(k, bean);
		}
	}

}
